Sewage-spraying apparatus.



A. T. NABSTEDT.

SEWAGE SPRAYING APPARATUS.

APPLICATION FILED JULY 7. 1915- Patented Apr. 25, 1916.

2 M w 7m ARTHUR THEODORE NABSTEDT, OF NEW HAVEN, CONNECTICUT.

SEWAGE-SPRAYING APPARATUS.

Specification of Letters Patent.

Patented Apr. 25, rain.

Application filed July 7, 1915.- Serial No. 38,560.

To all whom it may concern:

Be it known that I, ARTHUR T. NABSTEDT, a citizen of the United Statesof America, residing at New Haven, county of New Haven, State ofConnecticut, have invented certain new and useful Improvements inSewage-Spraying Apparatus, of which the following is a specification.

My invention relates to sewage spraying devices designed to break upvertical jets of sewage into evenly distributed spray which afterpassing through the atmosphere deposit on filter beds or other surfacespreparedfor reception of the sewage. Devices of this kind are subject tovarious objections when made in the usual manner, in

that the jet orifices are liable to clog up, and

different amounts of sewage are discharged over the various unit areasalong different radii, thus producing uneven distribution upon thereceiving bed. When such clogging occurs it produces two bad effects.Until the nozzle is cleaned the capacity of discharge of the apparatusis reduced and while parts are removed for cleaning a solid stream ofsewage issues from the orifice and overdoses the filter bed in thevicinity of the nozzle. My invention overcomes these difiiculties andhas various other advantages hereinafter to be pointed out.

The best forms of apparatus embodying my invention at present known tome are illustrated in the accompanying sheet of drawings in which,

Figure 1 is a vertical axial section of one form of apparatus taken online 2-2 of Fig. 2. Fig. 2 is a horizontal section on line 11 of Fig. 1,looking downward. Fig. 3 is a vertical section taken on line 3-3 of Fig.2. Fig. 4 is a vertical axial section of a modified form of apparatuswith parts broken away. Fig. 5 is a vertical axial section of a secondmodified form, and Fig. 6 is a similar view of a third modified form.

Throughout the drawings like reference figures indicate like parts.

1, is the nozzle tip usually provided with a screw thread 2, so that itcan be connected to the sewage discharging pipe which delivers an upwardstream. Above the nozzle a tip and axially in line therewith is theusual spreader or deflector cone 3.

The problem is to so mount the inverted cone on the nozzle tip as topresent the least obstruction to the discharge of solid matter, likebits of matches, the least friction retarding the velocity of the jet,and the least deformation of thespreading sheet of liquid which is to bebroken up into as evenly distributed spray as possible. I accomplish asolution of these problems by supporting the inverted cone 3, by its tip4:, mounted on a knife blade 6, set in the nozzle tip 1, diametricallythereof but preferably arched upward therefrom so that the jet of sewagecan issuein a solid stream from the nozzle tip, not striking the conetip or its supporting knife blade until it has cleared the nozzle tip..The cone tip, which may be made separable and screwed on to cone 3, bythreaded joint 5, as shown in Figs. 1 and 3, is preferably given anapproximately elliptical cross section, as shown in Fig. 2, at and aboveits connection to knife blade 6.

The details of the attachment of knife blade support 6, to nozzle tip 1,may be various. In the form shown in Figs. 1, 2 and 3, which I call typeA, the knife blade ends are soldered into slots 8, 8, in lugs 7 7 caston either side of the nozzle tip. In the form shown in Fig. 41, which Icall type B, the ends of the knife blade are carried farther down andcast, soldered or otherwise fastened to the upper edge of threadedcollar 10, which screws on to a threaded boss 9, on the nozzle tip 1, sothat the height of the spreader tip above the nozzle tip may be adjustedin the field. In the third form shown in Fig. 5, which I call type C,there are lugs 11, cast or otherwise, mounted on the knife blade endsand provided with claws 12, 12, on their under faces. The face of thenozzle tip 1, is then provided with recesses 13, 13, having partlyundercut walls 14, 14, with which claws 12,12 cotiperate to form abayonet joint. In the form shown in Fig. 6, which 1 call type D, theknife blade 16, is made straight, or nearly so and set in slots, 17, 17,in the face of nozzle tip 1.v At one end it is pivoted to the tip bypivot pin 18, and the other end has a projecting, threaded spindle 20,which fits in slotted lug 19, on the nozzle tip and carries a jam nut21. In this form the cone tip 15, is extended beyond the knife bladeinto the nozzle bore, as shown.

In operation of types A, B and C, the sewage issues from the nozzle tipbore in a solid stream. It strikes the cone tip and supporting knifeblade simultaneously and is formed into a spreading cone of liquid whichis only slightly divided at two points by the knife blades. On accountof the approximately elliptical cross section of the cone tip at thepoint ofinsertioninto. the solid circular jet, the walls of the fluidcone are thickest at the points where they are slit by the knife blades.Consequently, as the movingbody of fluid passes on and-strikes thespreading cone of circular cross. section beyond, these thicker wallsarethinned down to an even thickness withthe other i portions of thefluid cone, and the slits made by the knife blades are healed .and.closed, so. that when the fluid cone. leaves the upper edge of spreader3, it has walls of even thickness throughout and as it growsstillthinner.

breaks up into an even spray depositing like quantities 'of sewage inevery unit are of dis.- tribution. -Type 'D,xdoes. not perform thisfunction with quite the sameperfection, but approximates it. In types A,B and C, there is'little liability to clogging because there is noobstruction within the. nozzle bore, and any 'solidparticle escapingfrom the bore will easily pass on one side orthe other of the archedknife blade. If apiece of wood or similar object does lodge under theknife blade it can be easily poked outwith a stick, without putting onesfingers in the-spurting sewage. Also in types B. and C, more. seriousclogging can be remedied by: removing. or loosening the. knife blade andcone, and then replacing. them. With type D, the liability. to cloggingis greaterbut the remedy is easy as the nut 21, can be loosened and theknife blade and spreading cone...tipped to one side on pivot 18,. thusgiving the.

nozzle full opportunity to free itself of the obstruction.

the. broken parts B and C, and new ones easily substituted. The partsare so compact, however, and the unsupported portion of the knife bladeso short that there is littleliability to breakage, even when very thinblades are used. As thenozzle bore is free from all! obstructionand-thesewageissues in a solid-jet, fluid friction is reduced to a minimumandthe highestvelocity of discharge is realizedfor a given capacity ofnozzle.

Experiments have shown that the best rep In case of breakage of. the.knife blade or cone tip, can be detached in types sults as to evendistribution of spray and otherdesiderata are secured when the height ofthe knife blade arch bears a certain relation to the diameter of bore ofnozzle tip. Thus when the nozzle bore is 3' inch the height of the archshould be inch, as shown in Fig. 1, whereas when the nozzle bore isinch, the height of the arch should be inch.

Various changes could be made in some of the details of constructionshown so long as the operative relation of parts is retainedsufficiently to embody the principle of my invention.

Having described my invention, I claim:

1. A nozzle for sewage spraying comprising in combination, a nozzle tip,a spreader cone having a tip of approximately elliptical cross section,and a knife blade support connecting the nozzle tip and spreader tip inline with the minor axis of the ellipse of the tip cross section.

2. A-nozzle for sewage spraying comprising in combination, a nozzle tip,a spreader cone having a tip of approximately elliptical cross section,and a knife blade support connecting the nozzle tip and spreader tip inline with the minoraxis of the ellipse of the tip cross section, saidconnection including a bayonet joint.

3. Anozzle for sewage spraying comprising in combination, a nozzle tip,a spreader cone having a tip of approximately elliptical crosssection,and a knife blade support connecting the nozzle tip and spreader tip inline with the minor axis of the ellipse of the tip cross section, saidconnection being detachable from the nozzle tip.

4. A nozzle for sewage spraying comprising in combination a nozzle tipfree from internal obstructions, an arched knife blade mounted on saidtip diametrically thereof, and an inverted spreader cone mounted on theknife blade and connected thereto at the exterior of the apex of thecone only, the axis of the cone being substantially coincident with theaxis of the nozzle tip.

5. A nozzle for sewage spraying comprising in combination a nozzle tip,an arched knife blade. support set in the outer face of the nozzle, anda spreader cone supported atthe middle of the knife blade arch byengagement with the exterior only of the cone at its extreme tip.

6. A nozzle for sewage spraying comprising in combination a nozzle tiphaving its bore free from obstruction, a spreader cone outside of, andin the line of discharge from, the nozzle tip, and supports for saidcone extending from the tip of the exterior of the cone to the exteriorof the nozzle tip.

7. A nozzle for sewage spraying comprising the combination of a nozzletip free from internal obstructions, an arched knife blade mounted onsaid tip diametrically thereof, and an inverted spreader cone mounted onthe knife blade and connected thereto at the exterior of the apex of thecone, the axis of the cone being substantially coincident With the axisof the nozzle tip and the diameter of the nozzle orifice beingconsiderably greater than the diameter of any portion of the cone whichis in contact with the 10 knife blade structure. v

ARTHUR THEODORE NABSTEDT.

Witnesses:

HELEN PIERREPONT SNOW, R TH SNOW NABSTEDT.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatcntm, Washington, D. G.

